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  <title>预定义常量</title>

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</div><hr /><div id="maxdb.constants" class="appendix">
 <h1>预定义常量</h1>

 <p class="simpara">下列常量由此扩展定义，且仅在此扩展编译入 PHP 或在运行时动态载入时可用。</p>
 <p class="para">
  The following constants to use with <span class="function"><a href="function.maxdb-options.html" class="function">maxdb_options()</a></span> are defined.
  For further description of these constants see 
  <a href="http://maxdb.sap.com/documentation/" class="link external">&raquo;&nbsp;http://maxdb.sap.com/documentation/</a>.
  <table class="doctable table">
   <caption><strong>MaxDB PHP client constants</strong></caption>
    
     <thead>
      <tr>
       <th>Constant</th>
       <th>Description</th>
      </tr>

     </thead>

     <tbody class="tbody">
      <tr>
       <td>MAXDB_COMPNAME</td>
       <td>The component name used to initialise the SQLDBC runtime environment.</td>
      </tr>

      <tr>
       <td>MAXDB_APPLICATION</td>
       <td>The application to be connected to the database.</td>
      </tr>

      <tr>
       <td>MAXDB_APPVERSION</td>
       <td>The version of the application.</td>
      </tr>

      <tr>
       <td>MAXDB_SQLMODE</td>
       <td>The SQL mode.</td>
      </tr>

      <tr>
       <td>MAXDB_UNICODE</td>
       <td>TRUE, if the connection is an unicode (UCS2) client or FALSE, if not.</td>
      </tr>

      <tr>
       <td>MAXDB_TIMEOUT</td>
       <td>
         The maximum allowed time of inactivity after which the connection to the 
         database is closed by the system.
       </td>
      </tr>

      <tr>
       <td>MAXDB_ISOLATIONLEVEL</td>
       <td>
         Specifies whether and how shared locks and exclusive locks are implicitly 
         requested or released.
       </td>
      </tr>

      <tr>
       <td>MAXDB_PACKETCOUNT</td>
       <td>
         The number of different request packets used for the connection.
        </td>
      </tr>

      <tr>
       <td>MAXDB_STATEMENTCACHESIZE</td>
       <td>
         The number of prepared statements to be cached for the connection for re-use.
       </td>
      </tr>

      <tr>
       <td>MAXDB_CURSORPREFIX</td>
       <td>
         The prefix to use for result tables that are automatically named.
       </td>
      </tr>

     </tbody>
    
  </table>

 </p>

 <p class="para">
  The function <span class="function"><a href="function.maxdb-fetch-array.html" class="function">maxdb_fetch_array()</a></span> uses a constant for
  the different types of result arrays. The following constants are
  defined:
  <table class="doctable table">
   <caption><strong>MaxDB fetch constants</strong></caption>
   
    <thead>
     <tr>
      <th>Constant</th>
      <th>Description</th>
     </tr>

    </thead>

    <tbody class="tbody">
     <tr>
      <td>MAXDB_ASSOC</td>
      <td>
       Columns are returned into the array having the fieldname as the array
       index.
      </td>
     </tr>

     <tr>
      <td>MAXDB_ASSOC_UPPER</td>
      <td>
       Columns are returned into the array having the upper case fieldname as the array
       index.
      </td>
     </tr>

     <tr>
      <td>MAXDB_ASSOC_LOWER</td>
      <td>
       Columns are returned into the array having the lower case fieldname as the array
       index.
      </td>
     </tr>

     <tr>
      <td>MAXDB_BOTH</td>
      <td>
       Columns are returned into the array having both a numerical index
       and the fieldname as the array index.
      </td>
     </tr>

     <tr>
      <td>MAXDB_NUM</td>
      <td>
       Columns are returned into the array having a numerical index to the
       fields. This index starts with 0, the first field in the result.
      </td>
     </tr>

    </tbody>
   
  </table>

 </p>
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